"For behold the Lord receiveth them up unto himself, in glory; and he doth suffer that they may do this thing, or that the people may do this thing unto them, according to the hardness of their hearts, that the judgments which he shall exercise upon them in his wrath may be just; and the blood of the innocent shall stand as a witness against them, yea, and cry mightily against them at the last day." Alma 14:11. (for more on the Book of Mormon a book I believe to be true and I beg you to read and learn more. Click here for more)
People are given agency to choose what they may but they can not choose the reward of those actions. I am also eternally grateful for the knowledge that through temple sealing families are united and connected in an eternal link from generation to generation. That is one of the reasons family history is so important. To begin your family history you can try either Family Search or ancestry.com.
In conclusion again my hearts and prayers go out to the families and friends of those who died or were injured in this horrible shooting. I hope that we continue to appreciate the service that those who fight for our freedom give us.